Pressure rise due to liquid thermal expansion - query
Pressure rise due to liquid thermal expansion - query
(OP)
Dear all,
I have a coil within a reactor. Coil is used for reactor heating/cooling pupose.
It’s a 3inch stainless steel, schedule 40 coil, 70m long coil with volume of 0.3m3. However, as I am assuming ZERO leak in the equation provided in the web link below i.e. the term, ‘ qt/v ‘ becomes ZERO.
With that zero leak assumption, the equation gives of 6.8bar per 1deg C rise for water. Is this possible? See attached calcs.
Has anybody used this equation in past and know the reference for the origin of this equation please?
http://www.chemkb.com/process/flare-and-vent-syste...
Thanks.
I have a coil within a reactor. Coil is used for reactor heating/cooling pupose.
It’s a 3inch stainless steel, schedule 40 coil, 70m long coil with volume of 0.3m3. However, as I am assuming ZERO leak in the equation provided in the web link below i.e. the term, ‘ qt/v ‘ becomes ZERO.
With that zero leak assumption, the equation gives of 6.8bar per 1deg C rise for water. Is this possible? See attached calcs.
Has anybody used this equation in past and know the reference for the origin of this equation please?
http://www.chemkb.com/process/flare-and-vent-syste...
Thanks.





RE: Pressure rise due to liquid thermal expansion - query
http://www.eng-tips.com/faqs.cfm?fid=1339
That sounds highly possible, but I haven't checked your calculation.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pressure rise due to liquid thermal expansion - query
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Pressure rise due to liquid thermal expansion - query
http://abiquim.org.br/congresso/cong_cd/fullpapers...
I would ignore the affects of elastic deformation and estimate the expansion as 12.4 bar/°C.
Since water is nearly incompressible, it does not take much water to increase pressure. For example, if you had an 8 inch water main, 1,000 feet long and all of the air was removed or purged from the water line, it would only take about one cup of water to bring the pressure up to 150 PSI.
RE: Pressure rise due to liquid thermal expansion - query
°C bar/°C
20 4.5
30 6.8
40 8.7
50 10.4
60 11.8
70 12.9
80 13.9
RE: Pressure rise due to liquid thermal expansion - query
thread124-171158: Volume for blocked piping & Thermal RV
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Pressure rise due to liquid thermal expansion - query
Regards,
KS